package com.lei.mingyuemall.serach.service.impl;

import com.alibaba.fastjson.JSON;
import com.lei.common.to.es.SkuEsModel;
import com.lei.mingyuemall.serach.config.MingYuemallElasticSearchConfig;
import com.lei.mingyuemall.serach.contant.EsConstant;
import com.lei.mingyuemall.serach.service.MallSearchService;
import com.lei.mingyuemall.serach.vo.SearchParam;
import com.lei.mingyuemall.serach.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Override
    public SearchResult search(SearchParam param)  {
        //动态构建出查询需要的DSL语句
        SearchResult result = null;

        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, MingYuemallElasticSearchConfig.COMMON_OPTIONS);
            //3.分析响应数据 封装成我们需要的数据
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }


    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        //构建DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        /**
         * 1.模糊匹配，过滤
         */
        // 构建bool query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 1.1 must 模糊匹配
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2 bool  filter  三级分类id查询
        if(null != param.getCatalog3Id()){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2 bool filter   品牌id查询
        if(null != param.getBrandId() && param.getBrandId().size() >0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        //1.2 bool filter   所有属性进行查询nestedBoolQuery
        if (param.getAttrs()!=null&&param.getAttrs().size()>0){
            for(String attrStr : param.getAttrs()){
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];
                final String[] attrValues = s[1].split(":");//这个属性的检索用的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
               //每一个都要生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //1.2 bool filter   库存是否有查询
        boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        //1.2 bool filter   价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] price = param.getSkuPrice().split("_");
            if(price.length==2){
                rangeQuery.gte(price[0]).lte(price[1]);
            }else if(price.length == 1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(price[1]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(price[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        //把以前所有的条件都拿来进行封装
        sourceBuilder.query(boolQuery);
        /**
         * 排序 分页 高量
         */
        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            /**
             * sort=saleCount_asc/desc
             * sort=skuPrice_asc/desc
             * sort=hotScore_asc/desc
             */
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }
        //2.2 分页  pageSize:5
        //pageNum:1 from:0 size:5 [0,1,2,3,4]
        //pageNum:2 from:5 size:5
        //from = (pageNum-1)*size
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3 高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }
        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        TermsAggregationBuilder brandId = brand_agg.field("brandId").size(50);
        //1.1 品牌子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2.分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        //2.1分类子聚合
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3.属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //属性子聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //属性子 子集合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL->"+s);


        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }
    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> skuEsmodel = new ArrayList<>();
        if (hits.getHits()!=null&&hits.getHits().length>0){
            for (SearchHit hit:hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                skuEsmodel.add(esModel);
            }
        }
        result.setProducts(skuEsmodel);

        //2.当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket:attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1.属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2.属性的名字
            String attrName= ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3.属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrValue(attrValues);
            attrVo.setAttrName(attrName);
            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);

        //3.当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket: brand_agg.getBuckets()){
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            long brandId = bucket.getKeyAsNumber().longValue();
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
//            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            String brandName= ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4.当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets){
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.getCatalogs();
        //5.分页信息
        long total = hits.getTotalHits().value;
        result.setPageNum(param.getPageNum());
        result.setTotal(total);
        int totalPages = total % EsConstant.PRODUCT_PAGESIZE == 0?(int) total/ EsConstant.PRODUCT_PAGESIZE:(int)(total / EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);
        return result;

    }


}
